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Discuss Large format popped around edges in the Canada Tile Advice area at TilersForums.com.
Maybe covering with the corded may have slowed the curing time also . So possible accumulation of factors there .BS5385, part 3, C.2.4:
"Once the floor tiling is installed, the heating system should not be run for at least 10 days in order to allow the tile bedding to cur/dry thoroughly".
3 days too soon shouldn't make too much difference, but the cold temps we've had recently would drastically slow the curing process.
Reply to Large format popped around edges in the Canada Tile Advice area at TilersForums.com